linux-kernel - [PATCH v12 13/18] xen/grant-table: Refactor gnttab

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Date:	Tue, 31 Dec 2013 23:35:40 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	stefano.stabellini@...citrix.com, mukesh.rathor@...cle.com
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH v12 13/18] xen/grant-table: Refactor gnttab_init

We have this odd scenario of where for PV paths we take a shortcut
but for the HVM paths we first ioremap xen_hvm_resume_frames, then
assign it to gnttab_shared.addr. This is needed because gnttab_map
uses gnttab_shared.addr.

Instead of having:
	if (pv)
		return gnttab_map
	if (hvm)
		...

	gnttab_map

Lets move the HVM part before the gnttab_map and remove the
first call to gnttab_map.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 drivers/xen/grant-table.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 99399cb..cc1b4fa 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -1173,22 +1173,17 @@ static int gnttab_setup(void)
 	if (max_nr_gframes < nr_grant_frames)
 		return -ENOSYS;
 
-	if (xen_pv_domain())
-		return gnttab_map(0, nr_grant_frames - 1);
-
-	if (gnttab_shared.addr == NULL) {
+	if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL)
+	{
 		gnttab_shared.addr = xen_remap(xen_hvm_resume_frames,
-						PAGE_SIZE * max_nr_gframes);
+					       PAGE_SIZE * max_nr_gframes);
 		if (gnttab_shared.addr == NULL) {
 			pr_warn("Failed to ioremap gnttab share frames (addr=0x%08lx)!\n",
 					xen_hvm_resume_frames);
 			return -ENOMEM;
 		}
 	}
-
-	gnttab_map(0, nr_grant_frames - 1);
-
-	return 0;
+	return gnttab_map(0, nr_grant_frames - 1);
 }
 
 int gnttab_resume(void)
-- 
1.8.3.1

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